Pig Latin with Two Methods

PigLatin.rb

def translate(word)
    start_point = vowels_start(word)
    end_point = word.length - 1
    
    if start_point == 0
        word + "ay"
    else
        word[start_point, end_point] + word[0, start_point] + "ay"
    end
end

def vowels_start(word)
    vowels = ["a", "e", "i", "o", "u"]
    
    if vowels.include?word[0]
        0
    elsif (vowels.include?word[1]) && (word[0,2] != "qu")
        1
    elsif vowels.include?word[2]
        2
    elsif vowels.include?word[3]
        3
    else
        nil
    end
end